Hi, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> writes: > On Thu, 12 Nov 2015, Felipe Balbi wrote: > >> >> >> Also, my problem seems to be sensitive to the host port being USB >> >> >> 3.0 since I have an older Lenovo X201 with USB 2.0 ports that does >> >> >> _not_ exhibit this problem. IOW when I connect my Arietta G25 mass >> >> >> storage gadget to the X201, it works properly for all G25 kernels >> >> >> that I have tried. > >> >> I'd blame UDC driver. We have several other UDCs working with the same >> >> configuration. >> > >> > Sounds reasonable to me. But that doesn't explain why it works okay >> > with the older Lenovo X201 laptop. >> >> it seems like only x240 is running > 4.0. What is x201 running ? Could >> be older, buggy xhci driver. > > Or maybe it uses EHCI, since Douglas described it as having USB 2.0 > ports. yeah, but 64 bytes is still wrong :-) -- balbi
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